I would guess the plant kingdom, as it produces seeds. The vascular system indicates that they are large plants (trees). Because of the large body, trees has a vascular system so it can transport water and nutritients throughout the body.
The one that would be very likely to happen to the plant and animal communities of that forest patch is : a. The forest communities will undergo succession
Such occurrence will only disturb the environment a little bit. In no time, the animal communities will get used to it and there will be no particular change in their condition
hope this helps
